In pursuit of a light build, I ordered 5" arms for my https://rotorbuilds.com/build/17561 and completely reworked it with the KISS electronics from https://rotorbuilds.com/build/12523

At first I though it will be quick but after a while I started desoldering and rearranging the components so they fit in the frame nicely. This slow approach payed off as I discovered some wires barely hanging at their places.
I was very disappointed by the quality of solder I bought from banggood. Very difficult to work with and it looks very dirty. I had to add lots of flux to make it work.

The final weight with GoPro Session5 (78g) and 1300mAh 5S (200g) is 612g. I can say I have hit my target. With lighter battery I can get below 600g. Later on I might switch to the lighter motors to knock it down even more.